What Are the Causes of Loud Engine Acceleration Noise?

[AbigailLee]

Engine acceleration noise can be caused by exhaust pipe leaks, dirty throttle valves, engine misfires, or transmission issues. Exhaust pipe leaks: When there is a leak in the intake or exhaust pipes, the exhaust flow rate increases during acceleration, resulting in loud roaring sounds. Dirty throttle valves: During acceleration, the engine load increases, requiring a higher throttle opening and increased fuel supply. If the throttle valve is clogged and fails to open optimally, it leads to poor air-fuel mixture ratio, causing noise during acceleration. Engine misfires: This refers to one or more cylinders not functioning properly, often manifesting as reduced vehicle power, severe exhaust pipe vibrations, and noticeable "popping" or "thumping" sounds from the engine. Transmission issues: The buzzing noise during acceleration may not always originate from the engine but could be due to worn transmission bearings or insufficient lubrication, leading to friction. To address loud engine acceleration noise, consider replacing the exhaust pipe, cleaning throttle valve carbon deposits, inspecting ignition coils and spark plugs, adding transmission lubricant, or installing soundproofing equipment in the vehicle.